I think this might work for my current task, but it won’t work in other scenarios. For example, when I need to add both the original and modified images to a single HEIC file, I have to use ImageIO instead.

Yes, these 48MP images from AVCaptureSession with AVCapturePhotoOutput. I will store it with heic or jpeg format. is there a way can write 48MP to file without CGImageDestination and it could modified metadata(exif info)? and I researched it for a while. were you referring this photo.fileDataRepresentation(with: AVCapturePhotoFileDataRepresentationCustomizer)?

No, My problem is that I encountered during development. I am using AVFoundation to develop a Camera app.

No, user didn't do anything. just click(long press) app icon on lock screen and after faceID unlock, app will be open, maybe some configuration are incorrect? Could you give me more information about when and why sceneWillResignActive will be called?